North Korea has transferred what are believed to be ballistic missile parts to a launch site in the country's northwestern region.

Diplomatic sources in Seoul say US satellite photos confirmed the parts had been transferred recently to the Tongchang-ri site. The move has alarmed South Korea and other nations which are keeping close watch.

Observers regard the move as a possible sign that the North is preparing to launch another long-range missile. [link to www3.nhk.or.jp] .